Scale



M. J. WEBER Oct. 9, 1956 SCALE 3 Sheets-Sheet 1 Filed Aug. 5, 1950 Oct.9, 1956 M. J. WEBER 2,756,038

` SCALE Filed Aug. 3, 1950. 3 Sheets-Sheet 2 M. J. WEBER Oct. 9, 1956SCALE Filed Aug. 3, ,1950

3 Sheets-Sheet 5 IN V EN TOR.'

MTH/15 J M5515,

United States Patent SCALE Mathias J. Weber, Chicago, Ill., asslgnor toContinental Scale Corporation, Chicago, Ill., a corporation of DelawareApplication August 3, 195i), Serial No. 177,453 16 Claims. (Cl. 2651-68)The present invention relates in general to weighing scales and has moreparticular reference `to a scale having comprising a length of wireeX-tending across said opening, Ithe Wire being hookingly platformmember on one side base element yof the scale.

her important object is to form the lever fulcrum Anot knife edges insepara-te knife edge pieces of hardened mg the same thereto -at thebearing notches therein.

by slotting and deforming the same to provide' openings formed withalined grooves in the lever forming elements, on opposite sides of theopenings, whereby to receive platform suspension stirrups rockably insaid openings; a further object ybeing to form said stirrups as sheetmetal stampings having upwardly facing medial platform carrying knifeedges therein and downwardly facing rlever engaging knife 2,766,038iiatented Oct. 9, 1956 a weighing levers, carrying indica-tor andassembly unit adapted for mounting in the Weighing scale structure as inaccurately predetermined position on the Another important yobject is toprovide indicator driving mechanism for a Weighing scale having a pairof shockabsorhing levers tiltably mounted on a common Iaxis anddrivingly interconnected by resilient spring means positively driven Itomovement of the Another important object is to provide a resilientbuffer of simplied and inexpensive character on the driving rack of anindicator comprising a length of wire forming a medial loop extendingoutwardly of the rack in position to engage an abutment when the rack ismoved toward the limit of its operating travel in one direction, one endof said wire being frictionally fitted and anchored in an opening formedin the rack, and the other end being mounted in a slot longitudinally ofthe rack.

Another important object is to provide simplified bearing means forsupporting an indicator driving rack for longitudinal movementcomprising a rack receiving slot 1n a rack supporting framesubstantially opposite a pinion element drivingly engaged by the rack.

The foregoing and numerous other important objects, advantages, andinherent functions of the invention will become apparent as the same ismore fully understood from the following description, which, taken inconnection with the accompanying drawings, discloses a preferredembodiment of the invention.

Referring to the drawings:

Fig. l is a perspective View of a weighing scale embodying the presentinvention',

Fig. 2 is a sectional view taken substantially along the line 2,2 inFig. l;

Fig. 3 is a sectional View taken substantially along thc line 3--3 inFig. 2;

Fig. 4 is a perspective view of the underside of a shell element forminga part of the weighing scale;

Fig. 5 is an exploded perspective View of parts of the scale;

Fig. 6 is a fragmentary sectional view taken substantially along theline 6-6 in Fig. 5;

Fig. 7 is a view similar to Fig. 6 showing a modified construction;

Fig. S is a perspective view scale;

Figs. 9 and l0 are sectional views taken substantially along the lines9--9 and lil-1t) in Fig. 8;

of a portion of the weighing Fig. ll is an exploded perspective view ofparts of the Y weighing scale;

Fig. l2 is a sectional view taken substantially along the line 12-12 inFig. 8; and

Fig. 13 is a sectional view taken substantially along the line llS-IS inFig. ll.

To illustrate the invention the drawings show a weighing scale 13 havinga relatively low weighing platform and hence well adapted for use as apersonal weight scale. To this end the scale comprises a support base14, weighing mechanism 15 carried by the base, a weight receivingplatform element 16 carried by the mechanism and adapted to move thesame in proportion to a weight deposited on the platform formeasurement, and graduated dial l?, forming a weight indicating meansexposed to view through a window ld in the platform element, indicatoractivating means 19 driven by the weighing mechanism to shift the dialwith respect to the window.

The base lll comprises a generally rectangular drawn sheet metal plate22 preferably having mounted corners and forming a base for the scaleand having an upstanding marginal ange defining the peripheral edge ofsaid plate. inwardly of said edge the plate is formed with depressions24 providing feet on the under side of the plate near the roundedcorners thereof, bearing pedestals 2S comprising preferably identicalsheet metal stampings of L-shaped configuration are provided. Thesepedestals each have a flange 26 formed with a central perforation andadapted to t snugly in a foot forming depression 24, pressed in theplate 22, the flange 26 being secured in place on the base plate 22 byupwardly punching and curling the material 24' of the base plate, at thecentral portion of the depression 24, through said central opening ofthe pedestal flange 26 to thereby, in a sense, rivet and firmly securethe pedestal element on the base in the depression 24. Each flange 26may be formed with an alining notch or notches 27 in position to engageupstruck projections 28 on the base plate for the purpose of accuratelydetermining the location of the pedestals in the depressions 24.

Each bearing pedestal 25 comprises an integral upstanding web portion 29having an upwardly facing bearing notch 30 formed at the upper end ofthe web. The weighing mechanism comprises a pair of opposed weighinglevers fulcrumed in the notches of the hearing pedestals, including arelatively long lever 31 supported on the pedestals at one end of thebase plate and a relatively short lever 32 supported on the pedestals atthe opposite end of the base plate, said levers extending from theirsupporting pedestals toward each other and being drivingly connected,each with the other, as at 33, substantially centrally of the weighingmechanism. The long lever underlies the short lever and has an integralnose portion 34 extending substantially medially between the spacedbearing pedestals which support the short lever in position forsuspension on a weighing spring 35. This spring is adjustably suspended,as by means of the adjusting nut 36 and spring supporting stem 37, on apreferably arcuately shaped or bowed strip 38, suitably anchored at itsopposite ends on the base plate, in position to suspendingly carry theweighing spring on the medial portions of the strip 38 by means of theadjusting nut 36 and support stem 37 which is connected with the upperend of the spring. The lower end of the spring may be formed with adetaching loop 39 formed for detachable engagement in a spring mountingnotch 4t) formed at the extremity of the nose portion 34 of the longlever.

The levers 3l and 32 are preferably formed as stamped sheet metal partshaving downwardly extending marginal flanges 41 formed therein at theperipheral edges thereof, and these flanges are notched as at 42 and 43,in the long lever, and 'at 42 and 43 in the short lever in positionregistering with the pedestal elements 25 on which said levers aresupported. The notches 42 and 42 are prefably just sufficiently wide toreceive the upstanding web 29 of a bearing pedestal therein, the notches43 and 43 being substantially wider. The bottoms of the notches,however, may be sharpened to form knife edges 44 adapted to rockinglyengage in the upstanding bearing notches 30 of the pedestals whereby tofulcrum the levers thereon. If desired the knife edges may be formed inseparate knife edge elements 45 comprising strips of hardened materialthat may then be riveted or otherwise securely .attached upon the flangeportions 4l of the levers in position extending in the notches.

By virtue of the interconnection of the levers at the central connection33 it will be seen that both levers arc suspended on the weighing spring35, the long lever being directly suspended on the spr-ing and the shortlever being supported on the long lever and hence indirectly supportedon the spring.

The weighing scale also includes the platform element le, the samepreferably comprising a drawn sheet metal shell having a central weightcarrying platform portion iti and an integral dependent and marginalskirt 47. Means is provided for supporting the platform element on theweighing levers 31 and 32 in position snugly overlying the same, withthe `marginal skirt 47 extending to and outwardly of the upstandingmarginal flange 23 of the base7 whereby the weighing levers, theindicating 'means and associated mechanism are enclosed between andwithin the casing structure offered by the base plate and the platformelement.

To this end the platform carries dependent supporting legs 43 preferablycomprising sheet metal elements of L-shaped configuration similar to thebearing pedestals 25 and attached on the underside of the platformelement in fashion similar to the attachment of the bearing pedestals onthe base plate. The lower ends of the legs 4S are formed with downwardlyfacing notches adapted to receive and rockingly rest upon supportstirrups 50 which in turn are rockingly supported in bearings 5l formedin the levers adjacent the lever fulcrum notches. In this connection theplatform supporting levers are accurately positioned and are oriented onthe platform near the corners thereof, and the bearings 51-are likewiseaccurately located in the levers.

The bearings 51 comprise each a slot-like opening S2 forced through thelever, therein,

in said S are preferably identical each stamping generally of V-shapededge 51 positely and outwardly extending lugs 55 having downwardlyfacing alined knife edges 56 therein, at the ends of the arms of theV-shaped element. A stirrup Sti is applied in each of the openings 52with the knife edges 56 rockingly seated in the Igrooves 53. Thestirrups are 52 with the medial The levers 31 and 32 are drivinglyconnected at 33 by means `of a stirrup 50 of construction andconfiguration preferably identical to the stirrups 50, the long leverCrum edges at the notches 42 adapted to extend freely in the thestirrups. Accordingly, platform for measurement will be applied upon thelevers and hence to the weighing springs. The weighing springs, inaccordance with well known principles, will be extend- In order toprovide means for indicating the being measured, the sub-assemblystructure weight present invention contemplates a 62 adapted to bemounted on the base plate 22 and thus to be enclosed between the baseplate and the platform element. The mechanism of the sub-assemblystructure is dnvingly connected with the weight scale formed thereon inposition opposite the window to be viewed therethrough from above theplatform element.

formed as a sheet bottom of the frame through which the material of thebase plate may be terial of the sub-assembly frame to hold it rmly inplace on the base plate.

The support base 14 lgauge sheet metal plate` preferably comprises thethin 22 which is a relatively flimsy member susceptible of limiteddeformation when stressed, even though remforced upward oifsetting ofthe channel portion 22 and the bending of the material of the base plate22 along the curved line of demarcation 122 substantially increases therigidity of the base plate, including the medial offset portions 22thereof. The subassembly structure 62 is readily deformable material.

The frame 63 may comprise a bottom panel 64 and integral side panels 65,upstanding along the lateral edges of the bottom panel are notched attheir upper ends as at 6g to provide a mounting for a transverseconnecting plate '70 which is formed with a perforation 71 adapted toreceive and form a bearing for the upper end of a turnable stem 72. The

The lower end of pintle portion '79 of reduced diameter adapted to bejournalled for turning Spring means 22, is pro draw the rack teeth intosnug driving the teeth of the pintle. The rack eleextending to the endof the frame 63 engagement with ment has an end remote from the pintle,said end being formed with a slot S4, the end of which slot forms aknife edge 85.

The spaced frame portions 67 carry a bearing stem d6 having oppositeends secured in openings formed in the frame portion 67. This stemcarries a pair of preferably sheet metal lever members S7 and failmounted on the stern for tilting movement thereon. The member 87comprises a sheet metal strip bent to provide an extended arm 89 and ashort arm 9d, both of said arms being formed with openings through whichthe shaft extends. The member 87 also has an integral portion 91 forminga notched seat 92 projecting outwardly of the arm 89. At its extremitythe arm 39 is notched as at 93 to form a hooked nose 94 adapted forinteritting connection in the slot 84 of the rack to drivingly connectthe rack with said arm 89. When so connected the notched portion 93 ofthe arm rockingly engages the knife edge 85 of the rack to draw the samelongitudinally against the influence of the spring 81.

The member S8 preferably comprises a sheet metal strip having arelatively long arm 95 and a short arm 97, both arms being formed withperforations for receiving the shaft 86, outwardly of the arms 89 and 99of the member Q7. 9i) and 97 of the lever members may be in abuttingrelationship on the stem, but the arm 95 is spaced outwardly of the arm89 providing a space therebetween. In said space the rod $6 carries aspring 95 coiled thereabout and having oppositely extending fingers,respectively, engaging in the offset notch 92 of the member S7 and in anotch 98 formed in the medial portions 99, of the lever member S5, whichextend between the arms 95 and 97 thereof. As a consequence the members87 and till are yieldingly urged in opposite directions on the stem 86,relative movement of the members under the inliuence or the spring beinglimited by a stop shoulder 190 formed on an inturned flange 101 at theextremity of the arm 95, said shoulder being in position to engage anedge of the arm 89 inwardly of the nose portion 94.

The medial portion 99 of the lever member SS is inclined downwardly, asat 162, to form a bearing edge 163. The structure 62, being mounted onthe base plate 22, extends upwardly thereof through an opening 1M formedin the nose portion of the long lever 31, said opening being preferablydefined by an upstanding peripheral flange 105 which serves to rigidifythe nose portion of the lever. The flange 195 may be interrupted at thenose end of the opening 1M to provide an integral tongue 186 on thelever extending into the opening in position to underlie and pressupwardly upon the bearing edge 163 of the lever member S3.

The spring 81', at all times, yieldingly urges the rack 81 in adirection drawing on the lever arm S9; and the spring 96, at all timesyieldinglv holds the lever arm 95 in engagement with the arm 89 so thatthe lever member SS and its bearing edge 103 are constantly biased in adirection to press the bearing edge 103 upon the tongue 106.Accordingly, when the levers 31 and 32 are moved downwardly against theinfluence of the suspension spring 35 in response to the application ofa weight to be measured on the platform, the tongue 106 will bedepressed beneath the bearing edge 103 thus allowing the lever member S8to be turned on the pin 66 by action of the spring S1 and 96, in adirection to follow the downward movement of the tongue 106. Themovement of the rack will, of course, be transmitted through the spindle72 to turn the dial plate 17 in proportion to the movement of the tongue1% and thus indicate the weight being measured at the window 18.

lt will be seen from the foregoing that the driving connection betweenthe levers 87 and 8% is of non-positive character in that the members 87and $8 are drivingly connected through the spring 96. This connectionmay yield and allow the lever arms 89 and 95 to separate in the eventthat the arm 95, driven by the tongue 1496 of the weighing lever 31, isturned abruptly by upward movement of the tongue beneath the bearingedge 103, as in the event that the weight being measured is suddenlyremoved from the weighing platform. Such a condition may occur in apersonal weight scale in the event that a person standing thereon jumpssuddenly from the scale. Even where a relatively heavy weight on thescale is removed more slowly, the suspension spring 35, being arelatively powerful spring, will tend to move the levers Si and 32upwardly with suflicient force to possibly damage the relatively fragileindicator actuating mechanisrn, if such force be applied positively toStich mechanisrn. The arrangement of the spring 96, however, in themanner herein taught, serves to protect the relatively delicateindicator mechanism against damage of the character mentioned, which ismost apt to occur at the knife edge 35 and in the rack and pinion teeth.

The present invention also includes an improved rack buffer constructioncomprising a length of flexible wire ltl adapted for easy assembly onthe rack in a slot 1% formed longitudinally therein. This slot hastapered ends so that a hooked end 109 of the resilient wire 107 may besecured in one end of the slot. The wire 197 may be bowed between itsends in the manner shown, and the end thereof remote from the hooked endmay bend, as at liti, to anchor said end yieldingly in the opposite endof the slot 16d. One of the frame portions 67 may be provided with anintegral finger 111 in position to be engaged by the bowed portion ofthe wire 197 when the rack reaches the limit of its movement against theinfluence of the spring 81', in order to provide a yielding buffereffect to check rack movement in the event that the lever member :18 isforced beyond such limit or movement by the tongue 106. Under suchconditions the effect of the buffer 197 is to counteract the influenceof the spring 96 and allow the lever 39 to separate from the shoulder 93to thereby limit the bearing force of the notch 93 on the knife edge 85to a value represented by the tension of the spring 96 at the instantwhen the shoulder 98 becomes disengaged from the arm 89. The effect ofthe buffer spring 107 is to apply the force of the spring 96 upon theknife edge S5 in gradually increasing fashion rather than abruptly asthe rack reaches the limit of its travel.

The dial 17, as will be seen, is supported horizontally on the mountingplate beneath the platform element 16, which at one end is provided witha preferably circular perforation 112 forming the window 18. Adjacentthe opening 112 the platform element is also formed with the opening 113to accommodate the upper end of the spring mounting stem 37 and theadjusting nut 36 which is sized to project outwardly of the platformelement through a portion of the opening 113 extending in the platformelement at the junction of the skirt and platform portions thereof. Theopenings 112 and 113 may be covered by a decorative escutcheon plate111i, preferably a sheet metal stamping, formed with fastening lugs 1.15adapted to extend through openings in the platform member and benttherebeneath to hold the escutcheon plate in place thereon. Theescutcheon plate may have a slot through which an edge of the adjustingnut 36 may extend, and a circular opening in registration with theopening 112. A glass window pane 116 may be held in place on theescutcheon plate in any suitable fashion to cover the opening 112.Beneath said window pane the platform element carries index means 117,preferably comprising a length of wire mounted on the platform elementin position extending diametrally of the opening 112 in position tooverlie the graduated edge of the dial 17, so that the dial may be readagainst the index means 117. ln order to facilitate the application ofthe index wire on the platform element in inexpensive fashion, the edgeof the opening 113 may be formed with a mounting notch 118. One end ofthe wire 117 may be provided with a hook, as at 119, adapted for hookingengagement in the notch 118. On the opposite side-of the opening 112 theplatform element may be provided with a pair of spaced slits 120 and thematerial of the platform element .may be depressed be- Thereafter thehook remote extremity of the wire may be bent through order to stretchthe wire diametrally across the opening at said slits.

In order to hold the platform element upon the levers 31 and Animportant feature of the invention resides in the spring mounting 40whereby the weighing levers are susleft portions of Fig. 5, theextremity or the nose portion 34 of the lever 31 is bent upwardly, on aline of bend and 1s dened by a pair 133 of the flange 130.

The spring 35 may be attached to the lever 31 by assemblmg the loop 39on the mounting 4t?, before the opposite sides of the loop respectivelyin the slot 131 and in the opening 128, with the medial portions of theloop extending beneath the web 132. When so disposed the fingers 129will extend lin position slightly spaced from and beneath diametricallyopposite sides of the lowermost coil of the spring. The lower end of thespring will be held, loosely against turning movement with respect tothe lever 31 by the abutinents provided, on opposite sides of the loop39, by the fingers 133 and the sides of the opening 128.

it will be noted that the web 132, by virtue of its inclination,provides a downwardly facing knife edge 134, at the intersection of itslower surface with the edge of the opening 128, said knife edge being inposition to engage the medial portions of the attached spring loop 39`on the axis of the spring. The foregoing spring mounting arrangementinsures that the spring will be supported at all times in the sameoperative relationship with respect to the lever. The spring cannotbecome for precise rocking engagement with the knife edge 134. Thearrangement though simple and inexpensive climinates friction, at thepoint of connection of the lever with the spring, as well as the dangerof a wedged or IO jammed connection, and hence provides for high accuracy of weight measurement.

It is thought that the invention and its numerous attendant advantageswill be foregoing description, and it is obvious that numerous changesmay be of said transfer levers comprising a leading and the other atrailing lever, means for movan advancing direction advancing direction,trailing lever with the indicator.

3. In a weighing scale having weighing means movable by a weight to bemeasured, and a shiftable weight indicator, the combination, with saidmeans and indicator, 4of indicator driving ment thereof in oppositedirections whereby yieldingly to cause the trailing lever to follow themovement of the leading lever in said advancing direction, and means andperforated to receive said pivot stem, an arm of each lever beingextended and formed to provide said thereon remote from said pivot 4. Ina weighing scale having weighing means movable by a weight to bemeasured, and a shiftable weight indicator, the combination, with saidmeans and indicator, of indicator driving means comprising a pair oftransfer levers mounted for rocking movement, one of said leverscomprising a leading and the other a trailing lever, means for movingsaid leading transfer lever in an advancing direction in response tomovement of said weighing means under the influence of a weight to bemeasured, yielding spring means urging said trailing transfer lever in adirection to follow the movement of the leading lever in said advancingdirection, cooperating stop means on said levers for limiting therelative movement thereof under the iniiuence of said spring means, andmeans drivingly connecting the trailing lever with the indicator,comprising a turnable spindle drivingly connected with said indicatorand formed with gear teeth, a rack bar having teeth engaged with thegear teeth of said spindle, said bar having a slot adapted to receivesaid trailing lever and formed with a knife edge at one end of said slotin position to engage the trailing lever with the knife edge in responseto movement of the weighing levers when a weight is applied to theplatform, and yielding spring means urging the rack bar in a directionto yieldingly hold the knife edge against said arm.

5. ln a weighing scale having weighing means movable by a weight to bemeasured and a shiftable weight indicator, the combination, with saidmeans and indicator, of indicator driving means comprising a turnablespindle drivingly connected with said indicator and formed with gearteeth, a rack bar having teeth engaged with the gear teeth of saidspindle, said bar having a slot formed with a knife edge at one end lofsaid slot, a pair of transfer levers, including a leading and a trailinglever, mounted for rocking movement, means for rocking said leadinglever in an advancing direction in -response to application of a weightto be measured on said weighing means, spring means urging said trailinglever yieldingly in a direction to follow the movement of the leadinglever in said advancing direction, cooperating stop means on said leversfor limiting relative movement thereof under the influence of saidspring means, said trailing lever having a driving arm disposed in saidslot in position to rockingly engage said knife edge whereby to drawsaid arm upon the knife edge in response to movement of the weighingmeans under the iniiuence of a weight to be measured, and yieldingspring means movably urging the rack bar in a direction to yieldinglyresist the advancing movement of said arm.

6, In a weighing scale having weighing means movable by a weight to bemeasured and a shiftable weight indicator, the combination, with saidmeans and indicator, of indicator driving mean-s comprising a turnablespindle drivingly connected with said indicator and formed with gearteeth, a rack bar having teeth engaged with the gear teeth of saidspindle, said bar having a slot formed with a knife edge at one end ofsaid slot, a pair `of transfer levers, including a leading and atrailing lever, mounted for rocking movement, means for rocking saidleading lever in an advancing direction in response to application of aweight to be measured on said weighing means, spring means urging saidtrailing lever yieldingly in a direction to follow the movement of theleading lever in said advancing direction, cooperating stop means onsaid levers for limiting relative movement thereof under the influenceof said spring means, said trailing lever having a driving arm disposedin said slot in position to rockingly engage said knife edge, said armhaving a notch adapted to receive said knife edge and a nose adapted forinterlitting reception in said slot whereby to draw said arm upon theknife edge in response to movement of the weighing means under theiniiuence of a weight to be measured, and yielding spring means movablyurging the rack bar in a direction to yieldingly resist the advancingmovement of said arm.

7. In a weighing scale having a weight receiving platform and a weightindicator, the combination therewith of weighing mechanism operable toactuate the indicator in response to the application of a weight on theplatform comprising a sheet metal plate forming a support base providedwith spaced apart upstanding sheet metal strips forming upwardly facingfulcrum bearings, at the opposite ends of the support base, a pair ofsheet metal plates forming levers having knife edge means at an end ofeach lever in position to engage with said fulcrum bearings to fulcrumsaid levers on the base, each at a corresponding end thereof, springmeans suspending said levers on said base and means for suspending theweighing platform on the levers, said platform having downwardlyextending support legs, each lever forming plate adjacent the basefulcrumed end thereof being formed with a transversely extending andupwardly Vfacing valley having a bottom of V-shaped sectionalconfiguration, and openings therethrough in said valley for receivingsaid support legs, and a stirrup extending in each opening and rockablycarrying a corresponding one of said support legs, each stirrup havingoppositely extending knife edges rockably seated on the bottom of a saidvalley on opposite sides of the opening in which the stirrup extends.

8. In a weighing scale having a weight receiving platform and a weightindicator, the combination therewith of weighing mechanism operable toactuate the indicator in response to the application of a weight on theplatform comprising a sheet metal plate forming a support base providedwith spaced apart upstanding sheet metal strips forming upwardly facingfulcrum bearings, at the opposite ends of the plate, a pair of the sheetmetal plates forming levers and having a downwardly inclined ange at oneend of each lever, said flange boing provided with spaced notchesforming spaced apart shoulders, and means forming knife edges betweensaid spaced apart shoulders for engagement with said fulcrum bearings tofulcrum said levers on the base, each at a corresponding end thereof,means to yieldingly suspend said levers on said base, said levers beingeach formed with an upwardly facing groove spaced inwardly of andparallel to said knife edge means, and being formed with openingstherethrough in said groove, adjacent said knife edge means, a stirrupin each of said openings and having knife edges riding in said groove onopposite sides of the opening in which disposed, said stirrups eachhaving an upwardly facing knife edge for engaging downwardly facingbearings on said platform.

9. In a weighing scale having weighing means movable by a weight to bemeasured, and a shiftable weight indicator, the combination, with saidweighing means and indicator, `of indicator driving means comprising arack bar movable longitudinally in one direction to drive the indicatorin response to movement of the weighing means under the influence of aweight to be measured and buffer means comprising a bowed elementanchored at one end on said rack and supported at the other end forshifting movement longitudinally of the rack in position to yieldinglyengage a stop shoulder for yieldingly buffering the rack at a limit ofits operating movement in one direction.

l0. A weighing scale comprising a weighing spring, a weighing leversuspended on said spring, said spring cornprising helical coils andhaving a terminal loop` said lever having a sheet metal nose formed withan upwardly inclined portion defining a downwardly facing knife edge, insaid inclined portion, in position to rockingly engage said loop, saidnose having a pair of spaced apart upstanding lugs in position tounderlie a loop adjacent collof said spring to retain the loop inoperative position with respect to the knife edge.

ll. A weighing scale comprising a weighing spring, a weighing lever-suspended on said spring, said spring cornprising helical coils andhaving a terminal loop, said lever spect to the knife edge.

12. A weighing scale comprising a weighing spring, a weighing leversuspended on said spring, said spring comprising helical coils andhaving a terminal loop, said knife edge.

13. In a weighing scale having weighing means movable by a weight to bemeasured, and a shftable weight wardly offset medial portion.

15. In a weighing scale having weighing means movable by a weight to bemeasured, and a shiftable Weight eral edge of said medial portion,whereby to rigidify the 14 and upstanding bearing pedestals secured inspaced apart relationship on `said plate at the corners thereof in saidmarginal portions for supporting said weighing means, on said base,outwardly of said upwardly offset medial portion.

16. A weighing scale comprising a weighing spring, a weighing leversuspended on said spring, said spring taining said spring loop againstrelative turmng movement on the knife edge.

References Cited in the le of this patent UNITED STATES PATENTS 322,870Turnbull July 21, 1885 848,757 Lomb Apr. 2, 1907 1,001,636 Goetz Aug.29, 1911 1,252,916 McFarlane Jan. 8, 1918 1,259,362 Chatillon Mar. 12,1918 1,310,940 Bergen July 22, 1919 1,407,987 Crane Feb. 29, 19221,563,089 Jaenchen Mar. 24, 1925 1,591,594 Wetzel July 6, 1926 1,779,927Bullock Oct. 28, 1930 1,790,509 Moyer Jan. 27, 1931 1,872,920 FisherAug. 23, 1932 1,980,045 Florman Nov. 6, 1934 2,003,360 Hansen June 4,1935 2,013,961 Hurt Sept. 10, 1935 2,016,703 Breaden Oct. 8, 19352,020,408 Fruth Nov. 12, 1935 2,056,546 Weber Oct. 6, 1936 2,070,786Eschenbacher Feb. 16, 1937 2,097,919 Garbell Nov. 2, 1937 2,098,845Weber Nov. 9, 1937 2,098,846 Weber Nov. 9, 1937 2,117,267 Ames May 17,1938 2,173,970 Lagerholm Sept. 26, 1939 2,228,874 Greenleaf Jan. 14,1941 2,232,830 Sutton Feb. 25, 1941 2,277,958 Conners Mar. 31, 19422,293,572 Sutton Aug. 18, 1942 2,310,560 Weber Feb. 9, 1943 2,321,585Cummings June 15, 1943 2,336,695 Maurer Dec. 14, 1943 2,466,724 MeyerApr. 12, 1949 FOREIGN PATENTS 429,990 Great Britain June 11, 1935103,994 Australia June 2, 1938

